Opening book details…
Can I read Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition on EtoBox?
Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition by C. Ian Schipper; William D.A. Rickard; Steven M. Reddy; David W. Saxey; Jonathan M. Castro; Denis Fougerouse; Zakaria Quadir; Chris Conway; David J. Prior; Kat Lilly is a Earth and Planetary Sciences article available to read on EtoBox.
What is Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition about?
Cristobalite is a low-pressure, high-temperature SiO 2 polymorph that occurs as a metastable phase in many geologic settings, including as crystals deposited from vapor within the pores of volcanic rocks. Such vapor-phase cristobalite (VPC) has been inferred to result from silica redistribution by acidic volcanic gases but a precise mechanism for its formation has not been established. We address this by investigating the composition and structure of VPC deposited on plagioclase substrates within a rhyolite lava flow, at the micrometer to nanometer scale. The VPC contains impurities of the form [AlO 4 /Na + ] 0 -coupled substitution of Al 3+ charge-balanced by interstitial Na + -which are typical of cristobalite. However, new electron probe microanalysis (EPMA) element maps show individual crystals to have impurity concentrations that systematically decline from crystal cores-to-rims, and atom probe tomography reveals localized segregation of impurities to dislocations. Impurity concentrations are inversely correlated with degrees of crystallinity [observed by electron backscatter diffraction (EBSD), hyperspectral cathodoluminescence, laser Raman, and transmission electron microsco
Who reads Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition?
It is typically read by researchers, students, and practitioners in Earth and Planetary Sciences.
- Author
- C. Ian Schipper; William D.A. Rickard; Steven M. Reddy; David W. Saxey; Jonathan M. Castro; Denis Fougerouse; Zakaria Quadir; Chris Conway; David J. Prior; Kat Lilly
- Publisher
- Mineralogical Society of America
- Published
- 2020
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)